Wildflower mini-meadow workshops will take place over the weekend of 20 and 21 April at RHS Gardens Wisley, Hyde Hall, Rosemoor and Harlow Carr in North Yorkshire.
The RHS will also promote its Perfect for Pollinators plant lists and there will be advice and ideas online to help people plant wildflowers and other plants to help pollinating insects.
The RHS and Mr Fothergill’s will be giving away 10,000 packets of wildflower seeds to the first people to register online at www.nationalgardeningweek.org.uk from 15 March.
On 18 April the RHS will host interactive activities in its gardens for school pupils and college students. Students will be able to interview and garden with scientists, botanists, TV presenters, curators, artists, horticulturists and people from across the gardening world to find out about opportunities.
On 20 April, anyone considering a career in horticulture as well as career changers with an interest in gardening will be able to visit RHS Garden Wisley for advice and inspiration.
RHS director general Sue Biggs said: "After enjoying the Olympic Park meadows in 2012 there is a great appetite from the British public to create their own version at home, which is great news for pollinating insects.
"We've also made promoting horticultural careers a key theme for us during National Gardening Week 2013, especially as there is a shortage of young people coming into the horticultural world, which is of major concern to the industry and sad for so many young people missing out on incredible career opportunities."